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在 Ubuntu 15.10 上为单个网卡设置多个 IP 地址

临时添加 IP 地址

首先,让我们找到网卡的 IP 地址。在我的 Ubuntu 15.10 服务器版中,我只使用了一个网卡。

运行下面的命令找到 IP 地址:

sudo ip addr

样例输出:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host 
valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:2a:03:4b brd ff:ff:ff:ff:ff:ff
inet 192.168.1.103/24 brd 192.168.1.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe2a:34e/64 scope link 
valid_lft forever preferred_lft forever

sudo ifconfig

样例输出:

enp0s3 Link encap:Ethernet HWaddr 08:00:27:2a:03:4b 
inet addr:192.168.1.103 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe2a:34e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:186 errors:0 dropped:0 overruns:0 frame:0
TX packets:70 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:21872 (21.8 KB) TX bytes:9666 (9.6 KB)
lo Link encap:Local Loopback 
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:217 errors:0 dropped:0 overruns:0 frame:0
TX packets:217 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 
RX bytes:38793 (38.7 KB) TX bytes:38793 (38.7 KB)

正如你在上面输出中看到的,我的网卡名称是 enp0s3,它的 IP 地址是 192.168.1.103

现在让我们来为网卡添加一个新的 IP 地址,例如说 192.168.1.104

打开你的终端并运行下面的命令添加额外的 IP。

sudo ip addr add 192.168.1.104/24 dev enp0s3

用命令检查是否启用了新的 IP:

sudo ip address show enp0s3

样例输出:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:2a:03:4e brd ff:ff:ff:ff:ff:ff
inet 192.168.1.103/24 brd 192.168.1.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet 192.168.1.104/24 scope global secondary enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe2a:34e/64 scope link 
valid_lft forever preferred_lft forever

类似地,你可以添加任意数量的 IP 地址,只要你想要。

让我们 ping 一下这个 IP 地址验证一下。

sudo ping 192.168.1.104

样例输出

PING 192.168.1.104 (192.168.1.104) 56(84) bytes of data.
64 bytes from 192.168.1.104: icmp_seq=1 ttl=64 time=0.901 ms
64 bytes from 192.168.1.104: icmp_seq=2 ttl=64 time=0.571 ms
64 bytes from 192.168.1.104: icmp_seq=3 ttl=64 time=0.521 ms
64 bytes from 192.168.1.104: icmp_seq=4 ttl=64 time=0.524 ms

好极了,它能工作!

要删除 IP,只需要运行:

sudo ip addr del 192.168.1.104/24 dev enp0s3

再检查一下是否删除了 IP。

sudo ip address show enp0s3

样例输出:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:2a:03:4e brd ff:ff:ff:ff:ff:ff
inet 192.168.1.103/24 brd 192.168.1.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe2a:34e/64 scope link 
valid_lft forever preferred_lft forever

可以看到已经没有了!!

正如你所知,重启系统后这些设置会失效。那么怎么设置才能永久有效呢?这也很简单。

添加永久 IP 地址

Ubuntu 系统的网卡配置文件是 /etc/network/interfaces

让我们来看看上面文件的具体内容。

sudo cat /etc/network/interfaces

输出样例:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto enp0s3
iface enp0s3 inet dhcp

正如你在上面输出中看到的,网卡启用了 DHCP。

现在,让我们来分配一个额外的地址,例如 192.168.1.104/24

编辑 /etc/network/interfaces

sudo nano /etc/network/interfaces

如下添加额外的 IP 地址。

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto enp0s3
iface enp0s3 inet dhcp
iface enp0s3 inet static
 address 192.168.1.104/24

保存并关闭文件。

运行下面的命令使更改无需重启即生效。

sudo ifdown enp0s3 && sudo ifup enp0s3

样例输出:

Killed old client process
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp0s3/08:00:27:2a:03:4e
Sending on LPF/enp0s3/08:00:27:2a:03:4e
Sending on Socket/fallback
DHCPRELEASE on enp0s3 to 192.168.1.1 port 67 (xid=0x225f35)
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp0s3/08:00:27:2a:03:4e
Sending on LPF/enp0s3/08:00:27:2a:03:4e
Sending on Socket/fallback
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 3 (xid=0xdfb94764)
DHCPREQUEST of 192.168.1.103 on enp0s3 to 255.255.255.255 port 67 (xid=0x6447b9df)
DHCPOFFER of 192.168.1.103 from 192.168.1.1
DHCPACK of 192.168.1.103 from 192.168.1.1
bound to 192.168.1.103 -- renewal in 35146 seconds.

注意:如果你从远程连接到服务器,把上面的两个命令放到一行非常重要,因为第一个命令会断掉你的连接。而采用这种方式可以保留你的 ssh 会话。

现在,让我们用下面的命令来检查一下是否添加了新的 IP:

sudo ip address show enp0s3

输出样例:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:2a:03:4e brd ff:ff:ff:ff:ff:ff
inet 192.168.1.103/24 brd 192.168.1.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet 192.168.1.104/24 brd 192.168.1.255 scope global secondary enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe2a:34e/64 scope link 
valid_lft forever preferred_lft forever

很好!我们已经添加了额外的 IP。

再次 ping IP 地址进行验证。

sudo ping 192.168.1.104

样例输出:

PING 192.168.1.104 (192.168.1.104) 56(84) bytes of data.
64 bytes from 192.168.1.104: icmp_seq=1 ttl=64 time=0.137 ms
64 bytes from 192.168.1.104: icmp_seq=2 ttl=64 time=0.050 ms
64 bytes from 192.168.1.104: icmp_seq=3 ttl=64 time=0.054 ms
64 bytes from 192.168.1.104: icmp_seq=4 ttl=64 time=0.067 ms

好极了!它能正常工作。就是这样。

想知道怎么给 CentOS/RHEL/Scientific Linux/Fedora 系统添加额外的 IP 地址,可以点击下面的链接。

工作愉快!

via: http://www.unixmen.com/assign-multiple-ip-addresses-to-one-interface-on-ubuntu-15-10/

作者:SK 译者:ictlyh 校对:Caroline

本文由 LCTT 原创编译,Linux中国 荣誉推出


本文转载来自 Linux 中国: https://github.com/Linux-CN/archive

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